San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
How Deep Do Rats Dig Holes Or Burrow Under Houses?
Asides from being a very smart animal with a high sense of adaptability, rats are keen diggers. With their dexterous paws and strong teeth, they can chew through plastic, wood, and even aluminum. This clearly shows how much of a good digger these rodents are. Also, if you have holes around your house, these rodents might be responsible for creating them.
Maybe you have rats digging holes or burrows under your house and you have always wanted to know how deep these holes are. The fact is these excellent diggers can dig holes as long as 3 feet and as deep as 18 inches. This digging skill allows them to create deep burrows and holes under your home
Due to their smart nature, rats don't just dig burrows and holes blindly. They dig with plans and prepare for the worst-case scenario by creating one or two exit points apart from the entry hole, in case they are attacked by a predator. Therefore, if you see a rat hole or burrow around your house, you must look around to find its exit hole. Unlike the entry hole which is usually clean and free from dirt, rats usually use thatches of grass to conceal their exit holes. This simply means you have to look around carefully to find it.
While examining these holes and burrows, you need to be very careful and avoid moving too close to it. Snakes or any other harmful animal could also be inhibiting the hole. If you have to dig in the hole or make close contact, make sure you are well protected.
